What is the height of overflow over vessel edge?

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Hello,

Consider a flow (at an x flow rate of incompressible fluid) flowing into a vessel (let's assume it's a round vessel with diameter d). How to calculate the height of overflow,h, over the edge of the vessel?

I know $flowrate_{In}$ = $flowrate_{out}$. At the outlet I don't know the velocity of the flow and the height (to calculate the area)